ubuntu instalado dentro de windows con wubi

No me dejaba arrancar el synaptic hasta que diritara el siguiente comando

sudo dpkg --configure -a

luego por alla abajo me preguntaba lo siguiente.

You chose not to install GRUB to any devices. If you continue, the boot │
│ loader may not be properly configured, and when your computer next │
│ starts up it will use whatever was previously in the boot sector. If │
│ there is an earlier version of GRUB 2 in the boot sector, it may be │
│ unable to load modules or handle the current configuration file. │
│ │
│ If you are already running a different boot loader and want to carry on │
│ doing so, or if this is a special environment where you do not need a │
│ boot loader, then you should continue anyway. Otherwise, you should │
│ install GRUB somewhere. │
│ │

Por ser una instalacion dentro de window se debe escoje la opcion si, pilas.
│ Continue without installing GRUB?